GPT-5.3-Codex 系統卡
OpenAI 發布了 GPT-5.3-Codex，這是一個最先進的代理編碼模型，結合了 GPT-5.2-Codex 的編碼能力與 GPT-5.2 的推理和專業知識，能夠處理涉及研究、工具使用和複雜執行的長期任務。該模型在生物學和網路安全領域被視為高能力，並為後者啟用了相應的增強安全措施。
February 5, 2026
GPT-5.3-Codex System Card
Introduction
GPT‑5.3-Codex is the most capable agentic coding model to date, combining the frontier coding performance of GPT‑5.2-Codex with the reasoning and professional knowledge capabilities of GPT‑5.2. This enables it to take on long-running tasks that involve research, tool use, and complex execution. Much like a colleague, you can steer and interact with GPT‑5.3-Codex while it’s working, without losing context.
Like other recent models, it is being treated as High capability on biology, and is being deployed with the corresponding suite of safeguards we use for other models in the GPT‑5 family. It does not reach High capability on AI self-improvement.
This is the first launch we are treating as High capability in the Cybersecurity domain under our Preparedness Framework, activating the associated safeguards. We do not have definitive evidence that this model reaches our High threshold, but are taking a precautionary approach because we cannot rule out the possibility that it may be capable enough to reach the threshold. Our safeguards for high capability in cybersecurity rely on a layered safety stack designed to impede and disrupt threat actors, while we work to make these same capabilities as easily available as possible for cyber defenders.
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ProductFeb 5, 2026
ProductFeb 2, 2026
PublicationDec 18, 2025
— OpenAI
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